dont gob pl and glass !

[oops!]

i added another layer of transom......

used pl preimum to bed it.....waited 24 hrs to tab it in.

i noticed some "air bubbles" in the glass after it cured....

ground the "air bubbles out"....10 mins later this is what i found.

im not a chemist...but this is not what i was hoping for.

pl is an extreamly strong adhesive....i would suggest it be used in a smear situation....thin coat...not gobbed (thick bead) and glassed over.

 

[ondarvr]

Re: dont gob pl and glass !

I have no experiance with PL, but some adhesives are affected by styrene in the resin, they absorb it and start to soften.

 

[tashasdaddy]

Re: dont gob pl and glass !

it takes a couple of days for globs to cure.

 

[drewmitch44]

Re: dont gob pl and glass !

If you use big globs of PL you will notice that 24 hours later if the globs are big enough they are warm. It is still curing at this point. You got to wait till its now soft like. Its hard to explain. If you feel that its soft like there is still liquid pl inside then at that point you could prick the skin of the pl and the goo inside will oozze out just like your picture ooops. I waited 3 days for mine to cure before i put my matt and roving over it. It works out good but you got to wait til that pl is ready and completely kicked.

 

[drewmitch44]

Re: dont gob pl and glass !

It looks like you grinded over the outer skin of the PL ooops. Thats what happened. Its just like you pricked the skin like i was saying above. Ive seen someone on another forum just go ahead and grind it all up whyle the PL is half cured so that the ooze would come out and then would cure faster. That way there were no suprises when grinding later.

 

[erikgreen]

Re: dont gob pl and glass !

This makes sense... PL is supposed to be moisture curing, so once a skin forms it'll slow curing of blobs, and if you cover the PL over with something it'll slow the cure too. On the bright side once your boat is on the water any remaining blobs will cure quick

I'm still interested in seeing what happens with a quick spritz with a water spray bottle to accelerate the cure.

I just attached a bunch of cleats (the kind that support the deck) using PL last night, looks good so far. Mostly I'm gluing flat wood to flat wood though (both with epoxy coating... dunno how that will work).

Erik

 

[oops!]

Re: dont gob pl and glass !

actually the pl was cured 24 houes.....then the glass layed....that was 2 weeks ago.

i just got round to grinding it now....and it poured out. ..so if you use gobs....give it a good cure...a week...then mabe glass over...but 24 hrs cure before glass is not enough....

i has a few "messy spots from bedding the strings.....i picked them off the boat hull.....sueezed them and there was still liquid inside after 4 days...i bedded the strings sunday night...and that was last night.

pl is a fantastic product....incredible strong.....i would think best used in a smear situation.......(expand the surface area)

cheers
oops

 

[drewmitch44]

Re: dont gob pl and glass !

oops you are not right! maybee not 24 hours but not a week! If you are talking about it did that more than a week after you did that then you eather did not apply it layered like you should have or you did not use the correct PL product. I use the PL 100% poly. And i never have a problem like that! Are you useing it in below freezing temps or something? oops something just dosent add up to what you are saying! I mean you are cool dude and all but something is shysty! I have used this stuff on at least 5 transom installs and never seen it still like that more than 2 or 3 days after! U use the smaller tubes but whatever even if you use the 28 oz tube unless you make the hole pencil size i dont believe it. I might see it if you make the spout that the PL comes out of Pencil size but noone would be stupid enough to do that. That is in the directions and also its on the nipple that is on the tube so i cant see anyone cutting the nipple on the tube pencil size thickness. I have used the stuff on stringers for 3 other boats and didnt see that affect eather for the stringers. Again if you are stupid enough to open up the tube too much i might see it happen. Other than that maybee it was a bad batch from the manufacturer. I could not see someone cutting the spout as big as the thickness as a pencil though. There is directions on the tubes i get and on the spout it says "do not cut past the line" and the line makes the stuff almost like spegetti coming out. It would be stupid to make it any thicker than that anyhow. I would call the company and ask whats up. They will eather tell you what is up or what you did wrong. I ues PL poly Construction adhesave. Ive seen you call it "PL 9000". I dont know what that is but i wont use it now. If you apply it in the thickness as a pencil tip and not as wide as the pencil itself then i dont want to use PL 9000. You should look up http://www.amazon.com/Henkel-10-2-Ounce-Polyurethane-Construction-P73948125/dp/B0002YVJG8 . That way you dont have to use the PL 9000. I dont know what that is but this stuff in the link is 100% poly. You apply it With the thickness as a TIP of a pencil and not the pencil itself like the directions say and like the spout tells you you should not have any problems.

 

[salty87]

Re: dont gob pl and glass !

i wonder how much temp makes a difference, probly a lot. oops, is your garage heated all day?

i've had globs last several days but lately they harden quicker (this was left outside 24 hrs/day), just checking the glob hanging off the gun though. shade, temp, etc...

 

[ondarvr]

Re: dont gob pl and glass !

PL Premium and PL9000 are two different products, the 9000 is a solvent based adhesive not a urethane like the Premium. On their web site it says the 9000 is a good product, but for high strength, use PL 400 or PL Premium. It won't make a difference though when used under the stringers, it's only real job in this case is to hold the stringer off the hull, the glass will be doing all the work. Now that you have the stringers tabbed in they won't move.

 

[jcsercsa]

Re: dont gob pl and glass !

OHHH man ooops go to the bathroom when you do that !!! lol John

 

[contractorguy]

Re: dont gob pl and glass !

I use a lot of PL at work (sf450).. same stuff. If the tube freezes, it's trash...

Maybe a bad tube.

A giant glob will get hard in a couple days if it's warm enough

 

[oops!]

Re: dont gob pl and glass !

drew....dont know what to tell ya?

theres the pics...thats what happened. thats why i posted.....

it is possible its was a bad tube?? ive never seen the product do that before...i built my waterfall with that stuff....crazy strong....they also use it all day long on construction sites....its really good stuff......

i didnt clean it up....i might be able to go to the boat tonight...ittl be intresting to see what happens,,,? did it harden?....

ill post as soon as i can with pics.....

i spilt coffie on my lap top today...toasted it !....so im at my buddies place right now posting....

ill check in as soon as i can....

cheers guys
oops